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M41T81SMY View Datasheet(PDF) - STMicroelectronics

Part Name
Description
Manufacturer
M41T81SMY
ST-Microelectronics
STMicroelectronics ST-Microelectronics
M41T81SMY Datasheet PDF : 31 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Summary description
1
Summary description
M41T81S
The M41T81S is a low power Serial RTC with a built-in 32.768kHz oscillator (external crystal
controlled). Eight bytes of the SRAM (see Table 2: Clock register map on page 15) are used
for the clock/calendar function and are configured in binary coded decimal (BCD) format. An
additional 12 bytes of SRAM provide status/control of Alarm, Watchdog and Square Wave
functions. Addresses and data are transferred serially via a two line, bi-directional I2C
interface. The built-in address register is incremented automatically after each WRITE or
READ data byte.
The M41T81S has a built-in power sense circuit which detects power failures and
automatically switches to the battery supply when a power failure occurs. The energy
needed to sustain the clock operations can be supplied by a small lithium button supply
when a power failure occurs. Functions available to the user include a non-volatile, time-of-
day clock/calendar, Alarm interrupts, Watchdog Timer and programmable Square Wave
output. The eight clock address locations contain the century, year, month, date, day, hour,
minute, second and tenths/hundredths of a second in 24 hour BCD format. Corrections for
28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically.
The M41T81S is supplied in either an 8-pin SOIC or an 18-pin (MY), 300mil SOIC package
which includes an embedded 32kHz crystal.
The 18-pin, embedded crystal SOIC requires only a user-supplied battery to provide non-
volatile operation.
Figure 1. Logic diagram
XI(1)
XO(1)
SCL
SDA
VCC VBAT
M41T81S
IRQ/FT/OUT/SQW
VSS
AI09160
1. For SO8 package only
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